Fig. 1

a–c Axial HRCT of 33-year-old male (10 years disease duration) showing bilateral para-septal and centrilobular emphysema (arrows) (a), right middle lobe nodule (asterisk), hyperinflation, hyper-lucency (b). c, d Sagittal reformatted HRCT image showing bronchial thickening (circle) (c) and lower lobe fibrotic changes (arrowhead) (d)